<template>
  <div class='home-category' @mouseleave="categoryId = ''">
    <ul class="menu">
      <li v-for="item in menuList" :key="item.id" @mouseenter="categoryId = item.id"
        :class="{ active: item.id === categoryId}">
        <router-link :to="`/category/${item.id}`">{{ item.name }}</router-link>
        <template v-if="item.children">
          <router-link v-for="subItem in item.children" :key="subItem.id" :to="`/category/sub/${subItem.id}`">
            {{ subItem.name }}
          </router-link>
        </template>
        <template v-else>
          <XtxSkeleton width="60px" height="18px" style="margin-right:5px" bg="rgba(255,255,255,0.2)" />
          <XtxSkeleton width="50px" height="18px" bg="rgba(255,255,255,0.2)" />
        </template>
      </li>
    </ul>
    <!-- 弹层 -->
    <div class="layer">
      <h4>分类推荐 <small>根据您的购买或浏览记录推荐</small></h4>
      <ul v-if="currCategory && currCategory.goods && currCategory.goods.length">
        <li v-for="item in currCategory.goods" :key="item.id">
          <router-link :to="`/product/${item.id}`">
            <img :src="item.picture" alt="">
            <div class="info">
              <p class="name ellipsis-2">{{ item.name }}</p>
              <p class="desc ellipsis">{{ item.desc }}</p>
              <p class="price"><i>¥</i>{{ item.price }}</p>
            </div>
          </router-link>
        </li>
      </ul>
      <ul v-if="currCategory && currCategory.brands && currCategory.brands.length">
        <li class="brand" v-for="item in currCategory.brands" :key="item.id">
          <router-link to="/">
            <img :src="item.picture" alt="">
            <div class="info">
              <p class="name ellipsis-2">{{ item.name }}</p>
              <p class="desc ellipsis">{{ item.desc }}</p>
            </div>
          </router-link>
        </li>
      </ul>
    </div>
  </div>
</template>

<script>
import { computed, reactive, ref } from 'vue'
import { useStore } from 'vuex'
import { findBrandAPI } from '@/api/home'
import XtxSkeleton from '@/components/library/XtxSkeleton.vue'

export default {
  name: 'HomeCategory',
  setup () {
    const store = useStore()
    const brand = reactive({
      id: 'brand',
      name: '品牌',
      children: [
        {
          id: 'brand-child',
          name: '品牌推荐'
        }
      ],
      brands: []
    })
    // 最终使用的数据 = 9大分类 + 1个品牌
    const menuList = computed(() => {
      const list = store.state.category.list.map((item) => {
        return {
          id: item.id,
          name: item.name,
          children: item.children && item.children.slice(0, 2),
          goods: item.goods
        }
      })
      list.push(brand)
      return list
    })
    // 得到弹层的数据
    const categoryId = ref(null)
    const currCategory = computed(() => {
      return menuList.value.find(item => item.id === categoryId.value)
    })
    // 获取品牌数据
    findBrandAPI().then(data => {
      brand.brands = data.result
    })
    return {
      menuList,
      categoryId,
      currCategory
    }
  },
  components: { XtxSkeleton }
}
</script>

<style scoped lang='less'>
.home-category {
  width: 250px;
  height: 500px;
  background: rgba(0, 0, 0, 0.8);
  position: relative;
  z-index: 99;

  .menu {
    li {
      padding-left: 40px;
      height: 50px;
      line-height: 50px;
      transition: all 0.5s;
      cursor: pointer;

      &:hover,
      &.active {
        background: @xtxColor;
        padding-left: 42px;
      }

      a {
        margin-right: 4px;
        color: #fff;

        &:first-child {
          font-size: 16px;
        }
      }
    }
  }

  &:hover {
    .layer {
      display: block;
    }
  }
}

.layer {
  width: 990px;
  height: 500px;
  background: rgba(255, 255, 255, 0.8);
  position: absolute;
  left: 250px;
  top: 0;
  display: none;
  padding: 0 15px;

  h4 {
    font-size: 20px;
    font-weight: normal;
    line-height: 80px;

    small {
      font-size: 16px;
      color: #666;
    }
  }

  ul {
    display: flex;
    flex-wrap: wrap;

    li {
      width: 310px;
      height: 120px;
      margin-right: 15px;
      margin-bottom: 15px;
      border: 1px solid #eee;
      border-radius: 4px;
      background: #fff;

      &:nth-child(3n) {
        margin-right: 0;
      }

      a {
        display: flex;
        width: 100%;
        height: 100%;
        align-items: center;
        padding: 10px;

        &:hover {
          background: #e3f9f4;
        }

        img {
          width: 95px;
          height: 95px;
          transition: all 0.3s linear;

          &:hover {
            transform: scale(1.15);
          }
        }

        .info {
          padding-left: 10px;
          line-height: 24px;
          width: 190px;

          .name {
            font-size: 16px;
            color: #666;
          }

          .desc {
            color: #999;
          }

          .price {
            font-size: 22px;
            color: @priceColor;

            i {
              font-size: 16px;
            }
          }
        }
      }
    }

    li.brand {
      height: 180px;

      a {
        align-items: flex-start;

        img {
          width: 120px;
          height: 160px;
        }

        .info {
          p {
            margin-top: 8px;
          }

          .place {
            color: #999;
          }
        }
      }
    }
  }
}

.xtx-skeleton {
  animation: fade 1s linear infinite alternate;
}

@keyframes fade {
  from {
    opacity: 0.2;
  }

  to {
    opacity: 1;
  }
}
</style>
